Sustainable Investments Institute Email Format

Financial ServicesMaryland, United States2-10 Employees

The Sustainable Investments Institute (Si2) is a financial services organization that conducted impartial research on efforts to influence corporate behavior around social and environmental issues. It tracked shareholder resolutions proposed by investor activists, analyzed evolving campaigns, and identified central points of contention in reports intended to help institutional investors vote on proposals and guide corporate engagement. In addition to educational materials for members, Si2 published reports for the public on emerging issues of corporate and investor responsibility. The organization was primarily supported by its members and operated from 2010 through 2024.

Based in Boonsboro, Maryland, the organization operated within the financial services sector, providing independent research and analysis for institutional investors navigating governance and activist campaigns. In April 2026, Heidi Welsh retired as Executive Director, and reports indicate plans to open the platform publicly to engage a broader community with the information and data accumulated over many years.

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